gistfile1.txt

#[repr(u32)]
pub enum Status {
  Success = 0,
  NoMemory = 1,
  InvalidMatrix = 5,
  TypeMismatch = 13
}

pub mod surface {
  use std;

  pub struct Surface {
    opaque: *std::libc::c_void
  }

  impl Surface {
    pub fn to_png(&self, filename: &str) -> Status {
      unsafe {
        use std::c_str::ToCStr;
        let foreign_result = cairo_surface_write_to_png(self, filename.to_c_str());
        return foreign_result;
      }
    }
  }
}

I get the compiler message

cairo.rs:147:45: 147:53 error: use of undeclared type name `Status`
cairo.rs:147     pub fn to_png(&self, filename: &str) -> ::Status {
                                                         ^~~~~~~~
cairo.rs:182:91: 182:99 error: use of undeclared type name `Status`
cairo.rs:182     fn cairo_surface_write_to_png(self_value: *Surface, filename: std::c_str::CString) -> ::Status;
                                                                                                       ^~~~~~~~
cairo.rs:298:29: 298:37 error: use of undeclared type name `Status`
cairo.rs:298     pub fn invert(&self) -> ::Status {
                                         ^~~~~~~~
cairo.rs:318:52: 318:60 error: use of undeclared type name `Status`
cairo.rs:318     fn cairo_matrix_invert(self_value: *Matrix) -> ::Status;